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(No Model.) F H BROWN 2Sheefs-Sheet 1. v

TELEPHONE.

No. 536,914. Patented Apr. 2,1895.

(No Model.) P H BROWN 2 Sheets-Sheet 2.

TELEPHONE.

' N0.536,914. Patented Apr. 2, 1895.

UNITED STATES FRED H. BROWN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

PATENT OFFICE.

TO THE ECONOMY TRANSMISSION COMPANY, OF SAMEPLACE.

' TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 536,914, dated-April 2, 1895. Application filed October 17,1894. Serial No.526,Z16- (Remodel- To all whom it may concern: I

Be it known that I, FRED H.BROWN,a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Magneto-Telephones; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon,

. which form a part of this specification.

My invention relates to an improved arrangement and construction of the magnets of a magneto telephone transmitter and receiver.

My invention further contemplates a more economical and cheaper form of magnets than has been possible in those devised and patented by me in this art.

In all previous forms of magnets where two poles of similar polarity are opposed to the inductive influence of the diaphragm much trouble has been experienced in so placing the two other poles removed from the diaphragm in such relative position that they would not depolarize each other on account of close proximity (they being of a similar polarity).

The two magnets in this telephone are as far removed as possible from each other.

The lnvention is fully and clearly illustrated 1n the accompanying drawings,-wherein Figure 1 is a vertical section of the casing, showing the arrangement of the respective parts. Fig. 2 is a plan view of the instrument. Figs. 3 and 3 are detail views of the permanent magnet which lies within the case. Fig. l 1s a sectional View showing the outer permanent magnet straight; and Fig. 2 is a plan view of the casing shown in Fig. 1.

A designates a permanent magnet which may be either straight as shown in Fig. 1 or bent at its inner portion to conform to the cup of head of the casing as shown in Fig. 1. The

inner end of this permanent magnet A is proj ected into the casing as shown, so that the portion within the casing stands at a right angle to the surface of the diaphragm with its pole A closely adjacent thereto, as is usual, and

as indicated in the drawings, and on the stem within the casing is mounted a helix or coil C. The casing is preferably of cup-shape, and at its upper portion is formed with an annular rim flange, constituting a seat for the interior permanent magnet B. The magnet B is of the form shown in Figs. 3 and 3, and conforms to the interior of the casing, and is arranged on the flange thereof, with its body and pole remote and out of direct connection with the pole of the central magnet. The respective poles of the magnets, are designated by the letters N and S. 'On one of the poles of the magnet B, is a nipple or lug n, which contacts against or lies against the edge-surface of the diaphragm, so that the magnet B may become charged with the same polarity as the pole of the other magnet which is arranged centrally in the casing. By lodging or contacting the projection it against this diaphragm, it tends to counteract the magnetic pull on the diaphragm exerted by the centrally arranged magnet.

In Fig. 1 I have shown a means for adjusting therelation ot' the pole A of the magnet A to the diaphragm. This consists of a thumb-screw D on the outer part of the magnet, and an interior cushion-spring E.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a receiving telephone, the combination with the casing, and the diaphragm, of a permanent magnet, a pole of which lies adjacent to the diaphragm, and a permanent magnet located wholly within the casing remote from the other magnet, and having a small part of its surface in contact with the edge-surface of the diaphragm, so that the interior magnet is charged with the same polarity as the contacting pole of the other magnet, substantially as described.

2. In a receiving telephone, the combination with the casing, and the diaphragm, of a permanent magnet, a pole of which lies adjacent to the diaphragm, and a second permanent magnet lying wholly within the casing and remote and disconnected from the other magnet, and having one pole in contact with the outer-surface of the diaphragm, so that the interior magnet is charged with the same polarity as the contacting pole of the other magnet, substantially as described.

In a receiving telcphone,-the combination of a suitable casing and a diaphragm, of a permanent magnet, one pole of which lies adjacent to the diaphragm, and a second permanent magnet wholly within the casing and having its body and poles remote from the other magnet and one pole in contact with and supporting the diaphragm, so that the interior magnet is charged with the same polarity as the contacting pole of the other magnet, substantially as described.

4:. In a receiving telephone, the combination with the diaphragm and a casing, ot' suitable material formed with a flange at the other portion, of a permanent magnet seated on the flange of the casing and having one pole in' contact With the diaphragm, and a permanent magnet projected into the casing with its pole adjacent to the diaphragm and remote from the other magnet, so that the interior magnet is charged with the same polarity as the contacting pole of the other magnet, substantially as described.

5. In a receiving telephone, the combination with the diaphragm and a suitable casing formed with a seat in its upper portion, of the permanent magnet A, projected centrally in to the casing with its pole adjacent to the diaphragm, a semi-circular permanent magnet B, arranged in the seat of the casing with both poles remote from the central magnet A, and formed with a lug n, on which the outer edgesurface of the diaphragm rests, so that the interior magnet is charged with the same polarity as the contacting pole of the other magnet, substantially as and for the purpose specified.

6. In a receiving telephone, the combination with a suitable casing and a diaphragm, of a centrallylocated permanent magnet projected into the casing with its pole adjacent to the diaphragm, and a semi-circular permanent magnet arranged within the casing with its body and poles remote from the other magnet, so that the interior magnet is charged With the same polarity as the contacting pole of the other magnet, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

FRED II. BROWN.

\Vitnesses:

N. J. GoLL, F. A. BRONSON. 

